Inventories at the end of 2020 were reported in Fanny Limited's balance sheet at $60 million. In 2021, Fanny Limited changed its inventory method from average cost to FIFO. If the FIFO method had been used, 2020 ending inventory would have been $55 million. Ignoring the tax effect, the adjustment to 2021's beginning retained earnings would be O A. $50 million increase B. $5 million decrease OC. $5 million increase D. no change